2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/err.h>
39 #include <linux/string.h>
40 #include <linux/parser.h>
41 #include <linux/random.h>
42 #include <linux/jiffies.h>
44 #include <asm/atomic.h>
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_dbg.h>
51 #include <rdma/ib_cache.h>
55 #define DRV_NAME "ib_srp"
56 #define PFX DRV_NAME ": "
57 #define DRV_VERSION "0.2"
58 #define DRV_RELDATE "November 1, 2005"
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
65 static int topspin_workarounds = 1;
67 module_param(topspin_workarounds, int, 0444);
68 MODULE_PARM_DESC(topspin_workarounds,
69 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
71 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
73 static void srp_add_one(struct ib_device *device);
74 static void srp_remove_one(struct ib_device *device);
75 static void srp_completion(struct ib_cq *cq, void *target_ptr);
76 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
78 static struct ib_client srp_client = {
81 .remove = srp_remove_one
84 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
86 return (struct srp_target_port *) host->hostdata;
89 static const char *srp_target_info(struct Scsi_Host *host)
91 return host_to_target(host)->target_name;
94 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
96 enum dma_data_direction direction)
100 iu = kmalloc(sizeof *iu, gfp_mask);
104 iu->buf = kzalloc(size, gfp_mask);
108 iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
109 if (dma_mapping_error(iu->dma))
113 iu->direction = direction;
125 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
130 dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
135 static void srp_qp_event(struct ib_event *event, void *context)
137 printk(KERN_ERR PFX "QP event %d\n", event->event);
140 static int srp_init_qp(struct srp_target_port *target,
143 struct ib_qp_attr *attr;
146 attr = kmalloc(sizeof *attr, GFP_KERNEL);
150 ret = ib_find_cached_pkey(target->srp_host->dev,
151 target->srp_host->port,
152 be16_to_cpu(target->path.pkey),
157 attr->qp_state = IB_QPS_INIT;
158 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
159 IB_ACCESS_REMOTE_WRITE);
160 attr->port_num = target->srp_host->port;
162 ret = ib_modify_qp(qp, attr,
173 static int srp_create_target_ib(struct srp_target_port *target)
175 struct ib_qp_init_attr *init_attr;
178 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
182 target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
183 NULL, target, SRP_CQ_SIZE);
184 if (IS_ERR(target->cq)) {
185 ret = PTR_ERR(target->cq);
189 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
191 init_attr->event_handler = srp_qp_event;
192 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
193 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
194 init_attr->cap.max_recv_sge = 1;
195 init_attr->cap.max_send_sge = 1;
196 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
197 init_attr->qp_type = IB_QPT_RC;
198 init_attr->send_cq = target->cq;
199 init_attr->recv_cq = target->cq;
201 target->qp = ib_create_qp(target->srp_host->pd, init_attr);
202 if (IS_ERR(target->qp)) {
203 ret = PTR_ERR(target->qp);
204 ib_destroy_cq(target->cq);
208 ret = srp_init_qp(target, target->qp);
210 ib_destroy_qp(target->qp);
211 ib_destroy_cq(target->cq);
220 static void srp_free_target_ib(struct srp_target_port *target)
224 ib_destroy_qp(target->qp);
225 ib_destroy_cq(target->cq);
227 for (i = 0; i < SRP_RQ_SIZE; ++i)
228 srp_free_iu(target->srp_host, target->rx_ring[i]);
229 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
230 srp_free_iu(target->srp_host, target->tx_ring[i]);
233 static void srp_path_rec_completion(int status,
234 struct ib_sa_path_rec *pathrec,
237 struct srp_target_port *target = target_ptr;
239 target->status = status;
241 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
243 target->path = *pathrec;
244 complete(&target->done);
247 static int srp_lookup_path(struct srp_target_port *target)
249 target->path.numb_path = 1;
251 init_completion(&target->done);
253 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
254 target->srp_host->port,
256 IB_SA_PATH_REC_DGID |
257 IB_SA_PATH_REC_SGID |
258 IB_SA_PATH_REC_NUMB_PATH |
260 SRP_PATH_REC_TIMEOUT_MS,
262 srp_path_rec_completion,
263 target, &target->path_query);
264 if (target->path_query_id < 0)
265 return target->path_query_id;
267 wait_for_completion(&target->done);
269 if (target->status < 0)
270 printk(KERN_WARNING PFX "Path record query failed\n");
272 return target->status;
275 static int srp_send_req(struct srp_target_port *target)
278 struct ib_cm_req_param param;
279 struct srp_login_req priv;
283 req = kzalloc(sizeof *req, GFP_KERNEL);
287 req->param.primary_path = &target->path;
288 req->param.alternate_path = NULL;
289 req->param.service_id = target->service_id;
290 req->param.qp_num = target->qp->qp_num;
291 req->param.qp_type = target->qp->qp_type;
292 req->param.private_data = &req->priv;
293 req->param.private_data_len = sizeof req->priv;
294 req->param.flow_control = 1;
296 get_random_bytes(&req->param.starting_psn, 4);
297 req->param.starting_psn &= 0xffffff;
300 * Pick some arbitrary defaults here; we could make these
301 * module parameters if anyone cared about setting them.
303 req->param.responder_resources = 4;
304 req->param.remote_cm_response_timeout = 20;
305 req->param.local_cm_response_timeout = 20;
306 req->param.retry_count = 7;
307 req->param.rnr_retry_count = 7;
308 req->param.max_cm_retries = 15;
310 req->priv.opcode = SRP_LOGIN_REQ;
312 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
313 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
314 SRP_BUF_FORMAT_INDIRECT);
315 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
317 * Topspin/Cisco SRP targets will reject our login unless we
318 * zero out the first 8 bytes of our initiator port ID. The
319 * second 8 bytes must be our local node GUID, but we always
322 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
323 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
324 "activated for target GUID %016llx\n",
325 (unsigned long long) be64_to_cpu(target->ioc_guid));
326 memset(req->priv.initiator_port_id, 0, 8);
328 memcpy(req->priv.target_port_id, &target->id_ext, 8);
329 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
331 status = ib_send_cm_req(target->cm_id, &req->param);
338 static void srp_disconnect_target(struct srp_target_port *target)
340 /* XXX should send SRP_I_LOGOUT request */
342 init_completion(&target->done);
343 ib_send_cm_dreq(target->cm_id, NULL, 0);
344 wait_for_completion(&target->done);
347 static void srp_remove_work(void *target_ptr)
349 struct srp_target_port *target = target_ptr;
351 spin_lock_irq(target->scsi_host->host_lock);
352 if (target->state != SRP_TARGET_DEAD) {
353 spin_unlock_irq(target->scsi_host->host_lock);
354 scsi_host_put(target->scsi_host);
357 target->state = SRP_TARGET_REMOVED;
358 spin_unlock_irq(target->scsi_host->host_lock);
360 mutex_lock(&target->srp_host->target_mutex);
361 list_del(&target->list);
362 mutex_unlock(&target->srp_host->target_mutex);
364 scsi_remove_host(target->scsi_host);
365 ib_destroy_cm_id(target->cm_id);
366 srp_free_target_ib(target);
367 scsi_host_put(target->scsi_host);
368 /* And another put to really free the target port... */
369 scsi_host_put(target->scsi_host);
372 static int srp_connect_target(struct srp_target_port *target)
376 ret = srp_lookup_path(target);
381 init_completion(&target->done);
382 ret = srp_send_req(target);
385 wait_for_completion(&target->done);
388 * The CM event handling code will set status to
389 * SRP_PORT_REDIRECT if we get a port redirect REJ
390 * back, or SRP_DLID_REDIRECT if we get a lid/qp
393 switch (target->status) {
397 case SRP_PORT_REDIRECT:
398 ret = srp_lookup_path(target);
403 case SRP_DLID_REDIRECT:
407 return target->status;
412 static int srp_reconnect_target(struct srp_target_port *target)
414 struct ib_cm_id *new_cm_id;
415 struct ib_qp_attr qp_attr;
416 struct srp_request *req;
421 spin_lock_irq(target->scsi_host->host_lock);
422 if (target->state != SRP_TARGET_LIVE) {
423 spin_unlock_irq(target->scsi_host->host_lock);
426 target->state = SRP_TARGET_CONNECTING;
427 spin_unlock_irq(target->scsi_host->host_lock);
429 srp_disconnect_target(target);
431 * Now get a new local CM ID so that we avoid confusing the
432 * target in case things are really fouled up.
434 new_cm_id = ib_create_cm_id(target->srp_host->dev,
435 srp_cm_handler, target);
436 if (IS_ERR(new_cm_id)) {
437 ret = PTR_ERR(new_cm_id);
440 ib_destroy_cm_id(target->cm_id);
441 target->cm_id = new_cm_id;
443 qp_attr.qp_state = IB_QPS_RESET;
444 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
448 ret = srp_init_qp(target, target->qp);
452 while (ib_poll_cq(target->cq, 1, &wc) > 0)
455 list_for_each_entry(req, &target->req_queue, list) {
456 req->scmnd->result = DID_RESET << 16;
457 req->scmnd->scsi_done(req->scmnd);
463 target->req_head = 0;
464 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
465 target->req_ring[i].next = i + 1;
466 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
467 INIT_LIST_HEAD(&target->req_queue);
469 ret = srp_connect_target(target);
473 spin_lock_irq(target->scsi_host->host_lock);
474 if (target->state == SRP_TARGET_CONNECTING) {
476 target->state = SRP_TARGET_LIVE;
479 spin_unlock_irq(target->scsi_host->host_lock);
484 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
487 * We couldn't reconnect, so kill our target port off.
488 * However, we have to defer the real removal because we might
489 * be in the context of the SCSI error handler now, which
490 * would deadlock if we call scsi_remove_host().
492 spin_lock_irq(target->scsi_host->host_lock);
493 if (target->state == SRP_TARGET_CONNECTING) {
494 target->state = SRP_TARGET_DEAD;
495 INIT_WORK(&target->work, srp_remove_work, target);
496 schedule_work(&target->work);
498 spin_unlock_irq(target->scsi_host->host_lock);
503 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
504 struct srp_request *req)
506 struct scatterlist *scat;
507 struct srp_cmd *cmd = req->cmd->buf;
508 int len, nents, count;
512 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
513 return sizeof (struct srp_cmd);
515 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
516 scmnd->sc_data_direction != DMA_TO_DEVICE) {
517 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
518 scmnd->sc_data_direction);
523 * This handling of non-SG commands can be killed when the
524 * SCSI midlayer no longer generates non-SG commands.
526 if (likely(scmnd->use_sg)) {
527 nents = scmnd->use_sg;
528 scat = scmnd->request_buffer;
531 scat = &req->fake_sg;
532 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
535 count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents,
536 scmnd->sc_data_direction);
539 struct srp_direct_buf *buf = (void *) cmd->add_data;
541 fmt = SRP_DATA_DESC_DIRECT;
543 buf->va = cpu_to_be64(sg_dma_address(scat));
544 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
545 buf->len = cpu_to_be32(sg_dma_len(scat));
547 len = sizeof (struct srp_cmd) +
548 sizeof (struct srp_direct_buf);
550 struct srp_indirect_buf *buf = (void *) cmd->add_data;
553 fmt = SRP_DATA_DESC_INDIRECT;
555 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
556 cmd->data_out_desc_cnt = count;
558 cmd->data_in_desc_cnt = count;
560 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
563 buf->table_desc.key =
564 cpu_to_be32(target->srp_host->mr->rkey);
565 buf->table_desc.len =
566 cpu_to_be32(count * sizeof (struct srp_direct_buf));
568 for (i = 0; i < count; ++i) {
569 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
570 buf->desc_list[i].key =
571 cpu_to_be32(target->srp_host->mr->rkey);
572 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
574 datalen += sg_dma_len(&scat[i]);
577 buf->len = cpu_to_be32(datalen);
579 len = sizeof (struct srp_cmd) +
580 sizeof (struct srp_indirect_buf) +
581 count * sizeof (struct srp_direct_buf);
584 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
585 cmd->buf_fmt = fmt << 4;
592 static void srp_unmap_data(struct scsi_cmnd *scmnd,
593 struct srp_target_port *target,
594 struct srp_request *req)
596 struct scatterlist *scat;
599 if (!scmnd->request_buffer ||
600 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
601 scmnd->sc_data_direction != DMA_FROM_DEVICE))
605 * This handling of non-SG commands can be killed when the
606 * SCSI midlayer no longer generates non-SG commands.
608 if (likely(scmnd->use_sg)) {
609 nents = scmnd->use_sg;
610 scat = scmnd->request_buffer;
613 scat = &req->fake_sg;
616 dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents,
617 scmnd->sc_data_direction);
620 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
622 struct srp_request *req;
623 struct scsi_cmnd *scmnd;
627 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
629 spin_lock_irqsave(target->scsi_host->host_lock, flags);
631 target->req_lim += delta;
633 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
635 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
636 if (be32_to_cpu(rsp->resp_data_len) < 4)
637 req->tsk_status = -1;
639 req->tsk_status = rsp->data[3];
640 complete(&req->done);
644 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
645 (unsigned long long) rsp->tag);
646 scmnd->result = rsp->status;
648 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
649 memcpy(scmnd->sense_buffer, rsp->data +
650 be32_to_cpu(rsp->resp_data_len),
651 min_t(int, be32_to_cpu(rsp->sense_data_len),
652 SCSI_SENSE_BUFFERSIZE));
655 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
656 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
657 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
658 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
660 srp_unmap_data(scmnd, target, req);
662 if (!req->tsk_mgmt) {
664 scmnd->host_scribble = (void *) -1L;
665 scmnd->scsi_done(scmnd);
667 list_del(&req->list);
668 req->next = target->req_head;
669 target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
674 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
677 static void srp_reconnect_work(void *target_ptr)
679 struct srp_target_port *target = target_ptr;
681 srp_reconnect_target(target);
684 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
689 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
691 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
692 target->max_ti_iu_len, DMA_FROM_DEVICE);
694 opcode = *(u8 *) iu->buf;
699 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
701 for (i = 0; i < wc->byte_len; ++i) {
703 printk(KERN_ERR " [%02x] ", i);
704 printk(" %02x", ((u8 *) iu->buf)[i]);
705 if ((i + 1) % 8 == 0)
709 if (wc->byte_len % 8)
715 srp_process_rsp(target, iu->buf);
719 /* XXX Handle target logout */
720 printk(KERN_WARNING PFX "Got target logout request\n");
724 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
728 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
729 target->max_ti_iu_len, DMA_FROM_DEVICE);
732 static void srp_completion(struct ib_cq *cq, void *target_ptr)
734 struct srp_target_port *target = target_ptr;
738 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
739 while (ib_poll_cq(cq, 1, &wc) > 0) {
741 printk(KERN_ERR PFX "failed %s status %d\n",
742 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
744 spin_lock_irqsave(target->scsi_host->host_lock, flags);
745 if (target->state == SRP_TARGET_LIVE)
746 schedule_work(&target->work);
747 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
751 if (wc.wr_id & SRP_OP_RECV)
752 srp_handle_recv(target, &wc);
758 static int __srp_post_recv(struct srp_target_port *target)
762 struct ib_recv_wr wr, *bad_wr;
766 next = target->rx_head & (SRP_RQ_SIZE - 1);
767 wr.wr_id = next | SRP_OP_RECV;
768 iu = target->rx_ring[next];
771 list.length = iu->size;
772 list.lkey = target->srp_host->mr->lkey;
778 ret = ib_post_recv(target->qp, &wr, &bad_wr);
785 static int srp_post_recv(struct srp_target_port *target)
790 spin_lock_irqsave(target->scsi_host->host_lock, flags);
791 ret = __srp_post_recv(target);
792 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
798 * Must be called with target->scsi_host->host_lock held to protect
799 * req_lim and tx_head. Lock cannot be dropped between call here and
800 * call to __srp_post_send().
802 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
804 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
807 if (unlikely(target->req_lim < 1)) {
808 if (printk_ratelimit())
809 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
814 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
818 * Must be called with target->scsi_host->host_lock held to protect
819 * req_lim and tx_head.
821 static int __srp_post_send(struct srp_target_port *target,
822 struct srp_iu *iu, int len)
825 struct ib_send_wr wr, *bad_wr;
830 list.lkey = target->srp_host->mr->lkey;
833 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
836 wr.opcode = IB_WR_SEND;
837 wr.send_flags = IB_SEND_SIGNALED;
839 ret = ib_post_send(target->qp, &wr, &bad_wr);
849 static int srp_queuecommand(struct scsi_cmnd *scmnd,
850 void (*done)(struct scsi_cmnd *))
852 struct srp_target_port *target = host_to_target(scmnd->device->host);
853 struct srp_request *req;
859 if (target->state == SRP_TARGET_CONNECTING)
862 if (target->state == SRP_TARGET_DEAD ||
863 target->state == SRP_TARGET_REMOVED) {
864 scmnd->result = DID_BAD_TARGET << 16;
869 iu = __srp_get_tx_iu(target);
873 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
874 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
876 req_index = target->req_head;
878 scmnd->scsi_done = done;
880 scmnd->host_scribble = (void *) req_index;
883 memset(cmd, 0, sizeof *cmd);
885 cmd->opcode = SRP_CMD;
886 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
887 cmd->tag = req_index;
888 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
890 req = &target->req_ring[req_index];
895 req->tsk_mgmt = NULL;
897 len = srp_map_data(scmnd, target, req);
899 printk(KERN_ERR PFX "Failed to map data\n");
903 if (__srp_post_recv(target)) {
904 printk(KERN_ERR PFX "Recv failed\n");
908 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
909 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
911 if (__srp_post_send(target, iu, len)) {
912 printk(KERN_ERR PFX "Send failed\n");
916 target->req_head = req->next;
917 list_add_tail(&req->list, &target->req_queue);
922 srp_unmap_data(scmnd, target, req);
925 return SCSI_MLQUEUE_HOST_BUSY;
928 static int srp_alloc_iu_bufs(struct srp_target_port *target)
932 for (i = 0; i < SRP_RQ_SIZE; ++i) {
933 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
934 target->max_ti_iu_len,
935 GFP_KERNEL, DMA_FROM_DEVICE);
936 if (!target->rx_ring[i])
940 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
941 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
943 GFP_KERNEL, DMA_TO_DEVICE);
944 if (!target->tx_ring[i])
951 for (i = 0; i < SRP_RQ_SIZE; ++i) {
952 srp_free_iu(target->srp_host, target->rx_ring[i]);
953 target->rx_ring[i] = NULL;
956 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
957 srp_free_iu(target->srp_host, target->tx_ring[i]);
958 target->tx_ring[i] = NULL;
964 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
965 struct ib_cm_event *event,
966 struct srp_target_port *target)
968 struct ib_class_port_info *cpi;
971 switch (event->param.rej_rcvd.reason) {
972 case IB_CM_REJ_PORT_CM_REDIRECT:
973 cpi = event->param.rej_rcvd.ari;
974 target->path.dlid = cpi->redirect_lid;
975 target->path.pkey = cpi->redirect_pkey;
976 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
977 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
979 target->status = target->path.dlid ?
980 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
983 case IB_CM_REJ_PORT_REDIRECT:
984 if (topspin_workarounds &&
985 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
987 * Topspin/Cisco SRP gateways incorrectly send
988 * reject reason code 25 when they mean 24
991 memcpy(target->path.dgid.raw,
992 event->param.rej_rcvd.ari, 16);
994 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
995 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
996 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
998 target->status = SRP_PORT_REDIRECT;
1000 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1001 target->status = -ECONNRESET;
1005 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1006 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1007 target->status = -ECONNRESET;
1010 case IB_CM_REJ_CONSUMER_DEFINED:
1011 opcode = *(u8 *) event->private_data;
1012 if (opcode == SRP_LOGIN_REJ) {
1013 struct srp_login_rej *rej = event->private_data;
1014 u32 reason = be32_to_cpu(rej->reason);
1016 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1017 printk(KERN_WARNING PFX
1018 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1020 printk(KERN_WARNING PFX
1021 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1023 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1024 " opcode 0x%02x\n", opcode);
1025 target->status = -ECONNRESET;
1029 printk(KERN_WARNING " REJ reason 0x%x\n",
1030 event->param.rej_rcvd.reason);
1031 target->status = -ECONNRESET;
1035 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1037 struct srp_target_port *target = cm_id->context;
1038 struct ib_qp_attr *qp_attr = NULL;
1043 switch (event->event) {
1044 case IB_CM_REQ_ERROR:
1045 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1047 target->status = -ECONNRESET;
1050 case IB_CM_REP_RECEIVED:
1052 opcode = *(u8 *) event->private_data;
1054 if (opcode == SRP_LOGIN_RSP) {
1055 struct srp_login_rsp *rsp = event->private_data;
1057 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1058 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1060 target->scsi_host->can_queue = min(target->req_lim,
1061 target->scsi_host->can_queue);
1063 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1064 target->status = -ECONNRESET;
1068 target->status = srp_alloc_iu_bufs(target);
1072 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1074 target->status = -ENOMEM;
1078 qp_attr->qp_state = IB_QPS_RTR;
1079 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1083 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1087 target->status = srp_post_recv(target);
1091 qp_attr->qp_state = IB_QPS_RTS;
1092 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1096 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1100 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1106 case IB_CM_REJ_RECEIVED:
1107 printk(KERN_DEBUG PFX "REJ received\n");
1110 srp_cm_rej_handler(cm_id, event, target);
1113 case IB_CM_MRA_RECEIVED:
1114 printk(KERN_ERR PFX "MRA received\n");
1117 case IB_CM_DREP_RECEIVED:
1120 case IB_CM_TIMEWAIT_EXIT:
1121 printk(KERN_ERR PFX "connection closed\n");
1128 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1133 complete(&target->done);
1140 static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1142 struct srp_target_port *target = host_to_target(scmnd->device->host);
1143 struct srp_request *req;
1145 struct srp_tsk_mgmt *tsk_mgmt;
1149 spin_lock_irq(target->scsi_host->host_lock);
1151 if (target->state == SRP_TARGET_DEAD ||
1152 target->state == SRP_TARGET_REMOVED) {
1153 scmnd->result = DID_BAD_TARGET << 16;
1157 if (scmnd->host_scribble == (void *) -1L)
1160 req_index = (long) scmnd->host_scribble;
1161 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1163 req = &target->req_ring[req_index];
1164 init_completion(&req->done);
1166 iu = __srp_get_tx_iu(target);
1171 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1173 tsk_mgmt->opcode = SRP_TSK_MGMT;
1174 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1175 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1176 tsk_mgmt->tsk_mgmt_func = func;
1177 tsk_mgmt->task_tag = req_index;
1179 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1184 spin_unlock_irq(target->scsi_host->host_lock);
1185 if (!wait_for_completion_timeout(&req->done,
1186 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1188 spin_lock_irq(target->scsi_host->host_lock);
1190 if (req->cmd_done) {
1191 list_del(&req->list);
1192 req->next = target->req_head;
1193 target->req_head = req_index;
1195 scmnd->scsi_done(scmnd);
1196 } else if (!req->tsk_status) {
1197 scmnd->result = DID_ABORT << 16;
1202 spin_unlock_irq(target->scsi_host->host_lock);
1206 static int srp_abort(struct scsi_cmnd *scmnd)
1208 printk(KERN_ERR "SRP abort called\n");
1210 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1213 static int srp_reset_device(struct scsi_cmnd *scmnd)
1215 printk(KERN_ERR "SRP reset_device called\n");
1217 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1220 static int srp_reset_host(struct scsi_cmnd *scmnd)
1222 struct srp_target_port *target = host_to_target(scmnd->device->host);
1225 printk(KERN_ERR PFX "SRP reset_host called\n");
1227 if (!srp_reconnect_target(target))
1233 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1235 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1237 if (target->state == SRP_TARGET_DEAD ||
1238 target->state == SRP_TARGET_REMOVED)
1241 return sprintf(buf, "0x%016llx\n",
1242 (unsigned long long) be64_to_cpu(target->id_ext));
1245 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1247 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1249 if (target->state == SRP_TARGET_DEAD ||
1250 target->state == SRP_TARGET_REMOVED)
1253 return sprintf(buf, "0x%016llx\n",
1254 (unsigned long long) be64_to_cpu(target->ioc_guid));
1257 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1259 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1261 if (target->state == SRP_TARGET_DEAD ||
1262 target->state == SRP_TARGET_REMOVED)
1265 return sprintf(buf, "0x%016llx\n",
1266 (unsigned long long) be64_to_cpu(target->service_id));
1269 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1271 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1273 if (target->state == SRP_TARGET_DEAD ||
1274 target->state == SRP_TARGET_REMOVED)
1277 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1280 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1282 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1284 if (target->state == SRP_TARGET_DEAD ||
1285 target->state == SRP_TARGET_REMOVED)
1288 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1289 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1290 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1291 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1292 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1293 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1294 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1295 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1296 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1299 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1300 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1301 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1302 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1303 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1305 static struct class_device_attribute *srp_host_attrs[] = {
1306 &class_device_attr_id_ext,
1307 &class_device_attr_ioc_guid,
1308 &class_device_attr_service_id,
1309 &class_device_attr_pkey,
1310 &class_device_attr_dgid,
1314 static struct scsi_host_template srp_template = {
1315 .module = THIS_MODULE,
1317 .info = srp_target_info,
1318 .queuecommand = srp_queuecommand,
1319 .eh_abort_handler = srp_abort,
1320 .eh_device_reset_handler = srp_reset_device,
1321 .eh_host_reset_handler = srp_reset_host,
1322 .can_queue = SRP_SQ_SIZE,
1324 .sg_tablesize = SRP_MAX_INDIRECT,
1325 .cmd_per_lun = SRP_SQ_SIZE,
1326 .use_clustering = ENABLE_CLUSTERING,
1327 .shost_attrs = srp_host_attrs
1330 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1332 sprintf(target->target_name, "SRP.T10:%016llX",
1333 (unsigned long long) be64_to_cpu(target->id_ext));
1335 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1338 mutex_lock(&host->target_mutex);
1339 list_add_tail(&target->list, &host->target_list);
1340 mutex_unlock(&host->target_mutex);
1342 target->state = SRP_TARGET_LIVE;
1344 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1345 scsi_scan_target(&target->scsi_host->shost_gendev,
1346 0, target->scsi_id, ~0, 0);
1351 static void srp_release_class_dev(struct class_device *class_dev)
1353 struct srp_host *host =
1354 container_of(class_dev, struct srp_host, class_dev);
1356 complete(&host->released);
1359 static struct class srp_class = {
1360 .name = "infiniband_srp",
1361 .release = srp_release_class_dev
1365 * Target ports are added by writing
1367 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1368 * pkey=<P_Key>,service_id=<service ID>
1370 * to the add_target sysfs attribute.
1374 SRP_OPT_ID_EXT = 1 << 0,
1375 SRP_OPT_IOC_GUID = 1 << 1,
1376 SRP_OPT_DGID = 1 << 2,
1377 SRP_OPT_PKEY = 1 << 3,
1378 SRP_OPT_SERVICE_ID = 1 << 4,
1379 SRP_OPT_MAX_SECT = 1 << 5,
1380 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1384 SRP_OPT_SERVICE_ID),
1387 static match_table_t srp_opt_tokens = {
1388 { SRP_OPT_ID_EXT, "id_ext=%s" },
1389 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1390 { SRP_OPT_DGID, "dgid=%s" },
1391 { SRP_OPT_PKEY, "pkey=%x" },
1392 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1393 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1394 { SRP_OPT_ERR, NULL }
1397 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1399 char *options, *sep_opt;
1402 substring_t args[MAX_OPT_ARGS];
1408 options = kstrdup(buf, GFP_KERNEL);
1413 while ((p = strsep(&sep_opt, ",")) != NULL) {
1417 token = match_token(p, srp_opt_tokens, args);
1421 case SRP_OPT_ID_EXT:
1422 p = match_strdup(args);
1423 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1427 case SRP_OPT_IOC_GUID:
1428 p = match_strdup(args);
1429 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1434 p = match_strdup(args);
1435 if (strlen(p) != 32) {
1436 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1440 for (i = 0; i < 16; ++i) {
1441 strlcpy(dgid, p + i * 2, 3);
1442 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1448 if (match_hex(args, &token)) {
1449 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1452 target->path.pkey = cpu_to_be16(token);
1455 case SRP_OPT_SERVICE_ID:
1456 p = match_strdup(args);
1457 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1461 case SRP_OPT_MAX_SECT:
1462 if (match_int(args, &token)) {
1463 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1466 target->scsi_host->max_sectors = token;
1470 printk(KERN_WARNING PFX "unknown parameter or missing value "
1471 "'%s' in target creation request\n", p);
1476 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1479 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1480 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1481 !(srp_opt_tokens[i].token & opt_mask))
1482 printk(KERN_WARNING PFX "target creation request is "
1483 "missing parameter '%s'\n",
1484 srp_opt_tokens[i].pattern);
1491 static ssize_t srp_create_target(struct class_device *class_dev,
1492 const char *buf, size_t count)
1494 struct srp_host *host =
1495 container_of(class_dev, struct srp_host, class_dev);
1496 struct Scsi_Host *target_host;
1497 struct srp_target_port *target;
1501 target_host = scsi_host_alloc(&srp_template,
1502 sizeof (struct srp_target_port));
1506 target_host->max_lun = SRP_MAX_LUN;
1508 target = host_to_target(target_host);
1509 memset(target, 0, sizeof *target);
1511 target->scsi_host = target_host;
1512 target->srp_host = host;
1514 INIT_WORK(&target->work, srp_reconnect_work, target);
1516 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1517 target->req_ring[i].next = i + 1;
1518 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1519 INIT_LIST_HEAD(&target->req_queue);
1521 ret = srp_parse_options(buf, target);
1525 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1527 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1528 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1529 (unsigned long long) be64_to_cpu(target->id_ext),
1530 (unsigned long long) be64_to_cpu(target->ioc_guid),
1531 be16_to_cpu(target->path.pkey),
1532 (unsigned long long) be64_to_cpu(target->service_id),
1533 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1534 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1535 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1536 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1537 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1538 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1539 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1540 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1542 ret = srp_create_target_ib(target);
1546 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1547 if (IS_ERR(target->cm_id)) {
1548 ret = PTR_ERR(target->cm_id);
1552 ret = srp_connect_target(target);
1554 printk(KERN_ERR PFX "Connection failed\n");
1558 ret = srp_add_target(host, target);
1560 goto err_disconnect;
1565 srp_disconnect_target(target);
1568 ib_destroy_cm_id(target->cm_id);
1571 srp_free_target_ib(target);
1574 scsi_host_put(target_host);
1579 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1581 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1583 struct srp_host *host =
1584 container_of(class_dev, struct srp_host, class_dev);
1586 return sprintf(buf, "%s\n", host->dev->name);
1589 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1591 static ssize_t show_port(struct class_device *class_dev, char *buf)
1593 struct srp_host *host =
1594 container_of(class_dev, struct srp_host, class_dev);
1596 return sprintf(buf, "%d\n", host->port);
1599 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1601 static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1603 struct srp_host *host;
1605 host = kzalloc(sizeof *host, GFP_KERNEL);
1609 INIT_LIST_HEAD(&host->target_list);
1610 mutex_init(&host->target_mutex);
1611 init_completion(&host->released);
1615 host->initiator_port_id[7] = port;
1616 memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1618 host->pd = ib_alloc_pd(device);
1619 if (IS_ERR(host->pd))
1622 host->mr = ib_get_dma_mr(host->pd,
1623 IB_ACCESS_LOCAL_WRITE |
1624 IB_ACCESS_REMOTE_READ |
1625 IB_ACCESS_REMOTE_WRITE);
1626 if (IS_ERR(host->mr))
1629 host->class_dev.class = &srp_class;
1630 host->class_dev.dev = device->dma_device;
1631 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1632 device->name, port);
1634 if (class_device_register(&host->class_dev))
1636 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1638 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1640 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1646 class_device_unregister(&host->class_dev);
1649 ib_dereg_mr(host->mr);
1652 ib_dealloc_pd(host->pd);
1660 static void srp_add_one(struct ib_device *device)
1662 struct list_head *dev_list;
1663 struct srp_host *host;
1666 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1670 INIT_LIST_HEAD(dev_list);
1672 if (device->node_type == IB_NODE_SWITCH) {
1677 e = device->phys_port_cnt;
1680 for (p = s; p <= e; ++p) {
1681 host = srp_add_port(device, p);
1683 list_add_tail(&host->list, dev_list);
1686 ib_set_client_data(device, &srp_client, dev_list);
1689 static void srp_remove_one(struct ib_device *device)
1691 struct list_head *dev_list;
1692 struct srp_host *host, *tmp_host;
1693 LIST_HEAD(target_list);
1694 struct srp_target_port *target, *tmp_target;
1695 unsigned long flags;
1697 dev_list = ib_get_client_data(device, &srp_client);
1699 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1700 class_device_unregister(&host->class_dev);
1702 * Wait for the sysfs entry to go away, so that no new
1703 * target ports can be created.
1705 wait_for_completion(&host->released);
1708 * Mark all target ports as removed, so we stop queueing
1709 * commands and don't try to reconnect.
1711 mutex_lock(&host->target_mutex);
1712 list_for_each_entry_safe(target, tmp_target,
1713 &host->target_list, list) {
1714 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1715 if (target->state != SRP_TARGET_REMOVED)
1716 target->state = SRP_TARGET_REMOVED;
1717 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1719 mutex_unlock(&host->target_mutex);
1722 * Wait for any reconnection tasks that may have
1723 * started before we marked our target ports as
1724 * removed, and any target port removal tasks.
1726 flush_scheduled_work();
1728 list_for_each_entry_safe(target, tmp_target,
1729 &host->target_list, list) {
1730 scsi_remove_host(target->scsi_host);
1731 srp_disconnect_target(target);
1732 ib_destroy_cm_id(target->cm_id);
1733 srp_free_target_ib(target);
1734 scsi_host_put(target->scsi_host);
1737 ib_dereg_mr(host->mr);
1738 ib_dealloc_pd(host->pd);
1745 static int __init srp_init_module(void)
1749 ret = class_register(&srp_class);
1751 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1755 ret = ib_register_client(&srp_client);
1757 printk(KERN_ERR PFX "couldn't register IB client\n");
1758 class_unregister(&srp_class);
1765 static void __exit srp_cleanup_module(void)
1767 ib_unregister_client(&srp_client);
1768 class_unregister(&srp_class);
1771 module_init(srp_init_module);
1772 module_exit(srp_cleanup_module);